Excellent! Take your time and look around!
IME, you can find everything you need here in these forums. Just look around and see how people are putting their tanks together. EVERYONE has a different way of plumbing, reefing, lighting, filtration and husbandry. But put them all together, research the methods.
Commonly followed rules I see is buy bigger than you need. You need a skimmer for a 180g tank, find one for a 250g rating, plus your sump water counts too, so maybe you're at 250g and then you'll want to look at 300-350g rated skimmers.
Plan for upgrades, someday you're going to want to do them. This is where bigger equipment comes in, like your return pump. You can figure out just what you need or buy a bigger one and then someday when you want to add a reactor or two, your pump can handle the extra flow.
I jumped in before I found the forums... So, I was going backwards here, trying to fix the mistakes I already made. That's not where you want to be.
Keep up the questions, that's the best thing to do, ask and research!!
And pictures, pictures are awesome! Keep us along for the ride, it's fun to watch other member's tanks evolve too!